
  /*
  * sbull.h -- definitions for the char module
  *
  * Copyright (C) 2001 Alessandro Rubini and Jonathan Corbet
  * Copyright (C) 2001 O'Reilly & Associates
  *
  * The source code in this file can be freely used, adapted,
  * and redistributed in source or binary form, so long as an
  * acknowledgment appears in derived source files.  The citation
  * should list that the code comes from the book "Linux Device
  * Drivers" by Alessandro Rubini and Jonathan Corbet, published
  * by O'Reilly & Associates.   No warranty is attached;
  * we cannot take responsibility for errors or fitness for use.
  *
  */
 
 
 #include <linux/ioctl.h>
 
  /* Multiqueue only works on 2.4 */
 #ifdef SBULL_MULTIQUEUE
 #    warning "Multiqueue only works on 2.4 kernels"
  #endif
 
  /*
  * Macros to help debugging
  */
 
  #undef PDEBUG             /* undef it, just in case */
 #ifdef SBULL_DEBUG
 #  ifdef __KERNEL__
      /* This one if debugging is on, and kernel space */
 #    define PDEBUG(fmt, args...) printk( KERN_DEBUG "sbull: " fmt, ## args)
 #  else
      /* This one for user space */
 #    define PDEBUG(fmt, args...) fprintf(stderr, fmt, ## args)
 #  endif
 #else
 #  define PDEBUG(fmt, args...) /* not debugging: nothing */
 #endif
 
 #undef PDEBUGG
 #define PDEBUGG(fmt, args...) /* nothing: it's a placeholder */
 
 
 #define SBULL_MAJOR 0       /* dynamic major by default */
 #define SBULL_DEVS 2        /* two disks */
 #define SBULL_RAHEAD 2      /* two sectors */
 #define SBULL_SIZE 2048     /* two megs each */
 #define SBULL_BLKSIZE 1024  /* 1k blocks */
 #define SBULL_HARDSECT 512  /* 2.2 and 2.4 can used different values */
 
 #define SBULLR_MAJOR 0      /* Dynamic major for raw device */
 /*
  * The sbull device is removable: if it is left closed for more than
  * half a minute, it is removed. Thus use a usage count and a
  * kernel timer
  */
 
 typedef struct Sbull_Dev {
    int size;
    int usage;
    struct timer_list timer;
    spinlock_t lock;
    u8 *data;
 #ifdef SBULL_MULTIQUEUE
    request_queue_t *queue;
    int busy;
 #endif
 }              Sbull_Dev;
 
